Improvement in hollow-tile floors



section of this invention.

AIINITEE STATES PATENT EEICEo GEORGE H. JOHNSON AND BALTHASAR KREISCHER, OF NEW YORK, N. Y.

IMPROVEMENT IN HoLLow-TILE FLooRs.

Specification forming part of Letters Patent No. l 12,926, dated March 21, 1871.

To all whom it may concern:

Be it known that we, GEORGE H. JOHNSON vand BALTHASAE KRErscHEE,- both of the city, county, and State of New York, have invented a new and Improved Hollow-Tile Floor; and we do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which drawing- Figure l represents a longitudinal vertical Fig. 2 is a plan or top view of the same, the floor-boards havin-g been removed to expose the parts below.

Similar letters indicate corresponding parts.

This invention relates to a floor which is composed ot' hollow arched tiles, .provided with dovetailed grooves near their bottom edges to catch over the lower flanges of the iron girders of a fire-proof building, and consists in the employment of recesses in the upper convex surface of said tiles to receive strips of wood, to which the floor-boards are nailed. Said arched bottointiles are made of a length corresponding to the distances between the girders, in such a manner that a hollow floor is obtained which is strong, durable, and very simple in its construction, and which, on account ofthe circulation of air through it, prevents dampness and an injurious iniiuence of atmospheric changes. the hollow arched' tiles are combined tillingstrips of clay, which are secured in the dovetailed recesses of the tiles below the girders, so as to iill up the interstices between the adjoining tiles, and to produce a good finish of the ceiling.

In the drawing, the letter A designates a hollow arched tile, the cross-section of which is shaped as shown in Fig. l, and which is made of such a length that it ts between the iron girders B of a fire-proof building. Said tile is provided near its base with dovetailed with v somewhat below the girders, so as to makeroom for the filling-strips D, which are made of clay in any desirable form or shape, and` the upper parts of which are so formed that they can be inserted in the dovetailed grooves c, as shown in Fig. l. By these means the -spaces intervening between the adjoining tiles are tilled up and a good finish is given to the ceiling. The hollow7 arched tiles A are formed about one foot wide,'more or less, and they are placed on the girders side by side, as shown in Fig. 2. sufficient strength to the floor, and the resisting power of the tiles is still further increased by the strips d of wood, which extend across them, being fitted into the recesses c.

By these means a floor is obtained which is comparatively light, which can be readily put up, and which forms a good protection for the loor against moisture or any changes in the temperature or in the atmosphere.v

If desired, currents of hot or cold air can be passed through the hollow lioor for the purpose of heating or cooling, as may be required.

What we claim as new, and desire to secure by Letters Patcnt, is- Y l. A hollow arched tile, provided with re-A cesses c in its convex upper surface for the reception of Hoor-supporting strips d, substantially as shown and described.

2. The removable clay lling-strips D, in combination with the hollow arched tiles A and double-flanged girders B, as herein set forth, for the purpose specified.

GEO. H. JOHNSON. BALTHASAR KREISCHER. Witnesses:

W. HAUEF, E. F. KASTENHUBER.

Their arched tops impart- 

